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JPH0385878

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DESCRIPTION JPH0385878
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver for transmitting, for example, an audio signal wirelessly to a viewer or a
surround speaker. SUMMARY OF THE INVENTION The present invention relates to, for example,
in a television receiver for transmitting an audio signal wirelessly to a viewer or a surround
speaker, a transmitter for transmitting an optical signal modulated by the audio signal is a main
body of the television receiver. As a result, the configuration of the television receiver is
simplified and the usability for the viewer is improved as compared with the case of using a
separate transmission unit. Further, according to the present invention, by providing a plurality
of light emitting elements in the transmission unit and arranging the plurality of light emitting
elements in the upper part of the main body of the television receiver, the range in which the
optical signal can be favorably received is broadened. It is [0002] A system for transmitting audio
signals wirelessly via infrared rays is being applied to home appliances. FIG. 10 shows an
example of a conventional infrared transmitting and receiving system. In FIG. 10, (1) is a
television receiver, (2) is a transmitting unit having a light emitting element (3), (4) is a
transmitting unit ( The power supply cord of 2), and the power cord (5) of the transmission unit
(2) is connected to the earphone jack (1a) of the television receiver (1). Also, (6) is a receiving
unit shared with a commander having a light receiving element (7) (not shown), (8) shows a
manual power switch, and an audio signal reproduced in this receiving unit (6) is a code It is
supplied to the head phone (10) through (9). According to FIG. 10, it is possible to view a desired
program without disturbing the third party even in the middle of the night, and the viewer can
move relatively freely because of the wireless system. SUMMARY OF THE INVENTION However,
in the example of FIG. 10, the construction of the television receiver is complicated because the
transmission unit (2) is separate from the main body of the television receiver (1). At the same
time, the viewer has to connect the source code (4) and the manual power code (5) of the
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transmission unit (2), which is inconvenient. In view of the above, it is an object of the present
invention to simplify the configuration of the television receiver and improve the usability for the
viewer in a television receiver that wirelessly transmits audio signals. [Means for Solving the
Problems] A television receiver according to claim 1 comprises a transmitter for transmitting an
optical signal modulated by an audio signal (for example, the light emitter (13) in FIG. 1 and the
transmitter in FIG. 4). Circuit) incorporated in the main unit (11).
In the television receiver according to claim 2, in the television receiver according to claim 1, for
example, as shown in FIG. 1, a plurality of light emitting elements (14) are provided in the
transmitting portion, and the plurality of light emitting elements are emitted. The elements (14)
are arranged on the top of the main body (11). [Operation] According to the invention of the first
aspect, the television receiver is simplified as compared with the case of using a separate
transmission unit, and the viewer needs to use the connection such as the input code. Since there
is no problem, usability is improved. Generally, in the lower part of the main body of the
television receiver, an obstacle such as an ashtray is often placed, but in the case of the invention
according to claim 2, a plurality of light emitting elements (14 Because the light emitting
elements (14) are arranged, the ratio of the light signal from the light emitting element (14) to
the light blocking by the obstacle is small. Therefore, as compared with the case where the light
emitting element (14) is arranged at the lower part of the main body (11), the range in which the
optical signal can be received favorably becomes wider. An embodiment of a television receiver
according to the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1
shows the television receiver according to this embodiment. In FIG. 1, the cathode ray tube (CRT)
(12) of the main body (11) of the television receiver is horizontally oriented at the top of the
front panel (lla). Embed the extended luminescence II (13). This light emitting section (13), as
shown in FIG. 2, has eight light emitting diodes (LEDs) (14) in the near infrared region arranged
in a line in the horizontal direction, and then the visible region light blocking filter plate (15) on
the front surface. Arrange and form. Each LED (14) has a minute lens (14a) for adjusting the
divergence angle, and emits near-infrared light modulated with an audio signal at a
predetermined divergence angle. Also, the visible range light shielding filter plate (15) has a role
of protecting the LEDs (14) and preventing the LEDs (14) from being viewed from the outside.
Incidentally, the light emitting section <13> may be formed by arranging the filter elements
(15A) on the front surface by arranging the LED elements (14) in a plurality of lines as shown in
FIG. In FIG. 1, (16) shows a headphone as a whole, and this headphone <16) is formed of an
inverted U-shaped band (17), a headphone unit (18R), (18L) and an earpiece ER, EL, Battery
storage compartments (19R) and (19L) such as dry batteries are provided near both ends of the
band (17), and the main power switch circuit (20) of the manual is attached to the side of the
storage compartment (19L) of one battery. .
Further, light receiving elements (21R) and (21L) are disposed near the headphone units (18R)
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and (18L), respectively, and a light receiving element (21C) is also disposed at the central portion
of the band (17). FIG. 4 shows a transmission circuit incorporated in the main body (11>) of the
television receiver. In FIG. 4, (22L) and (22R) are respectively demodulated by the audio
demodulation circuit of the television receiver (1). Connection terminals to which the L-channel
and R-channel baseband audio signals are supplied, and these connection terminals (221) and
(22R) are respectively connected to one fixed contact of the switch circuit (23L) and the switch
circuit (23R). Connect to one of the fixed contacts. (24L) and (24R) are input terminals of L
channel and R channel audio signals respectively supplied from an external video source, and
these input terminals (24L) and (24R) are respectively connected to the other of the switch
circuit (23L) It is connected to the fixed contact and the other fixed contact of the switch circuit
(23R), and an audio signal generated at the movable contact of the switch circuit (23L) is
supplied to the FM modulation circuit (26L) through the buffer circuit (25L). The carrier wave of
fL (ζ2 ° 8 M touch) is FM modulated with the voice signal. Also, an audio signal generated at
the movable contact of the switch circuit (23R) is supplied to the FM modulation circuit (26R)
through the buffer circuit (25R) to obtain the frequency f l (! The carrier wave of (i2.3 M Hz) is
FM-modulated with the voice signal, and the respective output signals of the FM modulation
circuits (26L) and (26R) are combined by the mixing circuit (27) to the L E D (14) I will supply it.
FIG. 5 shows a receiver circuit incorporated in the headphone (16). In FIG. 5, (21) is a
combination of light receiving elements (21R), (21L) and (21C) (see FIG. 1). A light receiving
element, (28) is a preamplifier of the light receiving element (21), and an original signal R3
which is an output signal from which a direct current component of the preamplifier is removed
is a band pass filter (29 LH center frequency fL) and a band respectively The band pass filter
(29R) (central frequency f) is supplied, and the output signal of the band pass filter (29L) is
supplied to the left speaker (31L) through the FM demodulation circuit (30L) including the
power amplifier. The output signal of (29R) is supplied to the right speaker (31R) through the
FMil1 circuit (30R) including a power amplifier.
From these speakers (31L) and (31R), sounds reproduced from near infrared rays are emitted
respectively. Further, (32) shows a power supply line, and this power supply line <32) is
connected to the respective power supply terminals of the band pass filters (29L), (29R) and the
FM demodulation circuits (30L), (30R). The line (32) is further connected to the positive terminal
of the battery (34) via an auxiliary power switch circuit (32) which can be opened and closed by
electrical signals and a main power switch circuit (20) opened and closed manually. Ground the
negative terminal of. (35) shows a carrier wave detection circuit as means for detecting the
presence or absence of an optical signal, and this carrier wave detection circuit (35) is composed
of a band pass filter with a center frequency of f or f, a rectifier circuit and a binarization circuit. I
will do it. Therefore, in the present embodiment, the presence or absence of an optical signal is
determined depending on whether or not a carrier wave having the same frequency or f2 exists,
so that there is an advantage that it is not easily affected by disturbance light such as fluorescent
light. An original signal R3 generated by a preamplifier (28) is supplied to an input terminal of its
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carrier wave detection circuit (35), and a digital detection signal S generated at an output
terminal of the carrier wave detection circuit (35). Is supplied to the input terminal of the time
constant circuit (36) and one input terminal of the OR gate (37). The time constant circuit (36)
comprises an integrating circuit and a binarizing circuit, and generates a signal S1 delayed from
the input signal by time. This signal S1 is supplied to the other input terminal of the OR gate
(37>), and when the output signal S2 of this OR gate (37) is high level "1", the sub power switch
circuit (33) is closed and its output 48 No. S 2 When the low level is "0", the auxiliary power
switch circuit (33) is opened. The power supply line between the sub power supply switch circuit
(33) and the main power switch circuit (20) is connected to the preamplifier (28), the carrier
wave detection circuit (35), the time constant circuit (36) and the OR gate (37). Connect to the
power supply terminal. When the power of the television receiver of this example is turned on, as
shown in FIG. 6A, the currently received channel or external video source from the LED (14)
disposed at the top of the main body (11). The light signal is emitted at a divergence angle α
toward the headphone (16), which is an FM signal modulated by an audio signal of In many
cases, a short obstacle (38) such as an ashtray or the like is placed in front of the lower part of
the main body (11) of the television receiver. The light signal from (14) is hardly blocked by the
obstacle (38>), so the divergence angle α directly becomes an effective range in which the light
signal can be well received.
On the other hand, as shown in FIG. 7, it is possible to dispose the LED (14) under the main body
(11) of the television receiver, but in this case, the light signal from the LED (14) Partly blocked
by the object (38), the effective range β becomes β or α, and the headphones (16) can not
receive the light signal well. Therefore, when the LED (14) is disposed at the upper part of the
main body (11), there is a benefit that the range in which the optical signal can be well received
becomes wide. Further, in the present example, a plurality of LEDs (14) are provided in the light
emitting portion (13), and these LEDs (14) are arranged in a horizontally extended manner. In
this case, as shown in FIG. As shown, even if a relatively narrow obstacle (39>) intervenes
between the main body (11) of the television receiver and the headphones (16), both ends (13b)
of the light emitting portion (13) And (13C) are well received by the headphone (16). Meanwhile,
its luminescence! When the LED (14) is provided only in the central part (13a) of (13), the light
signal from the central part (13a) is blocked by the obstacle (39) and the head 7 is turned on. In
(16), it can not be received. That is, in consideration of the presence of such an obstacle (39), the
light signal when the LED (14) is provided only at the central portion (13a) of the light emission
8 (S (13) If the range that can be received is the range (40), the LED (14) is uniformly provided
between both ends (13b) and (13c) of the light emitting portion (13) as in this example (FIG. 6B)
The range (41) in which the optical signal can be well received when there is an advantage is
generally wider than the range (40). Next, another embodiment of the present invention will be
described with reference to FIGS. 8 and 9. In this embodiment, the audio signal of the television
receiver is transmitted to the so-called surround speaker wirelessly via infrared rays. The present
invention is applied to the following system. The surround method is a method of creating a
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three-dimensional sound field feeling by stereophonic sound from IJ Fux. FIG. 8 shows the
system configuration of this example. In FIG. 8, (43A) and (43B) are surround speakers
respectively, and these surround speakers (43 ^) and (43B) are each a television receiver. Place
the desired angle on both sides of the main body (11). Then, light emitting parts (42 ^) and (42B)
having the same structure as the light emitting part (13) are embedded in the upper part of both
sides (llb) and (IIC) of the main body (11) of the television receiver.
From these light emitting sections (42 ^) and (42B), light signals modulated with predetermined
surround sound signals are respectively emitted. Also, light receiving element substrates (44A>
and (44B) are embedded in the upper side of the main body (11) side of the surround speakers
43 ^) and (43B), and these surround speakers (43 ^) and A receiver circuit as shown in FIG. 5 is
provided inside (43B). Also in this example, since the light emitting portions (42A) and (42B) are
disposed on the top of the main body (11) of the television receiver, the main body (11) and the
surround speakers (43 ^) and (43B) Even if there is a short obstacle in between, transmission and
reception of the light signal can be performed well. Further, since the light emitting portions (42
^) and (42B) extend in the horizontal direction, there is a benefit that the range in which the
optical signal can be favorably received is wide as in the example of FIG. Furthermore, since the
light emitting portions (42A> and (42B) are arranged at the same height and the same depth as
the light receiving element substrates (44A) and (44B), respectively, as shown in FIG. There is
also a benefit that the surround speakers (43A) and the speakers (43B) can be disposed in close
contact with both sides of the main body (11) of the television receiver. The present invention is
not limited to the above-described embodiment, and it goes without saying that various
configurations can be adopted without departing from the scope of the present invention.
According to the present invention, the configuration of the television receiver can be simplified
as compared with the case of using a separate transmission unit, and the convenience of the
viewer can be improved. In addition, when a plurality of light emitting elements are arranged at
the upper part of the main body, the obstacle which is relatively short is not easily influenced,
and there is an advantage that the range in which the optical signal can be received favorably
becomes wide.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing an embodiment of the television receiver according to the
present invention, FIG. 2 and FIG. 3 are perspective views showing an example of the light
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emitting part of FIG. 1 respectively and FIG. 4 and FIG. 6A is a side view of the example of FIG. 1,
FIG. 6B is a plan view of the example of FIG. 1, and FIG. 7 is an example of FIG. 8 is a perspective
view showing another embodiment of the present invention, FIG. 9 is a front view for explaining
the operation of the embodiment shown in FIG. 8, and FIG. 10 is an example of a conventional
transmitting and receiving system. FIG.
(11) is a main body of a television receiver, (13) is a light emitting portion, <14> is a light
emitting diode (L E D), (16) is a headphone, (26L) and (26R) are FM modulation circuits, (42A)
and (42B) are respectively a light emitting unit, and (43A) and (43B> are surround speakers
respectively. Agent Hidetoshi Matsushima Figure 9 Band You 尤 Figure 2 f6, Dohusunae Figure
7? Shiba-Shin-Gi hit figure 10 procedure amendment book flat bottom date October 1
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